Dark matter constitutes roughly 85% of the matter density of the Universe, and represents a critical gap in our understanding of fundamental physics. Despite extensive experimental efforts, the only robust, positive empirical measurement of dark matter continues to come from cosmological and astrophysical observations. The Large Synoptic Survey Telescope (LSST) offers a versatile platform to investigate dark matter. This workshop will focus on new ideas for probing the fundamental nature of dark matter with LSST and other future observations.